Loud-speaking device for sound-reproducing machines



F. W. COOLEY LOUD SPEAKING DEVICE FOR SOUND REPRODUCING MACHINES Oct. 12 1926.

Filed Jan. 29, 1925 QMJ/ M i ,Grill/VIIIIIIIIIIIIIIIIIIIIIIl/IllIIIIIII!rIiII!Ifllfllllllllllil'ffll vlllllll/IIl/llllfdrill!VIII/IIIIIIIIIIIIIIIII!IllllI/II! rllffllffllll Patented Oct. 12, 1926.

UNITED STATES PATENT OFFICE.

FEED W. CQOLEY, OF MINNEAPOLIS, MINNESOTA.

IaOUD-SPEAKING DEVICE FOR SOUND-REPRODUCING MACHINES.

Application filed January This invention relates to a loud speaking device for a sound transmitting or sound reproducing machine, and while the device is capable of many applications, it partieularly is designed for use in modern well known radio receiving sets. Such receiving sets usually comprise a casing having a panel at the front thereof, the various parts of the apparatus being disposed in said casing. As

is well known, loud speakers are now commonly used with said radiosets. 'Such a loud speaker should be constructed to properly direct and transmit the sound waves produced so that the reproduced sound will be heard clearly and distinctly.

It is an object of this invention to provide a loud speaker for such a radio receiving set, which loud speaker comprises a tone modifier and is adapted to be secured to the panel of the radio receiving set.

It is a further object of the invention to provide a loud speaking device comprising a tone modifier which is secured to the front anel of the radio receiving apparatus and is disposed betweensaid panel and the sound reproducing device, said parts being supported by said panel.

It is also an object of the invention to provide a loud speaking device for a radio receiving apparatus comprising a tone modifier which is axially alined with an opening in the front panel of the radio receiving apparatus, a sound reproducing device comprising a diaphragm being secured co-axially with the tone modifier, said parts being supported by said panel,

It is still another object of the invention to provide a tone modifier comprising 00- axially arranged spacedtubes, one within the other, with a vielding spacing means therebetween, one of said tubes having a slot formed therein in alinement with the spacing means. together with means for securing said tubes together and clamping said spacin means therebetween.

Tt is still further an object of the invention to provide a tone modifier comprising spaced co-axially arranged tubes, one within t e other, the inner tube having a means secured thereto placing the same under stress, together with means securing the tubes to gether spaced from said last mentioned means.

These and other objects and advantages of the invention will be fully set forth in the 29, 1925. Serial No. 5,463.

following description made in connection with the accompanying drawings in which like reference characters refer to the same parts throughout the different views, and in which,

Fig. 1 is a top plan view of the device;

Fig. 2 is a central vertical longitudinal section through Fig. 1;

Fig. 3 is a view in end elevation of the device, as seen from the right of Fig. 1; and

Fig. 4 is a horizontal central sectionv of the inner tube with the resilient member used shown therewith.

Referring to the drawings, the device is shown comprising a base plate or member 5 having upstanding therefrom at one end. and secured thereto a plate 6. While the base 5 and plate 6 may be constructed in various ways, it is contemplated to have the base 5 form the bottom member of the casing of a radio receiving apparatus and the plate 6 to form the front panel thereof, Small blocks 6 are shown secured to the top of base 5 and about the rear side of plate 6 by means of which the parts can conveniently be secured together. The plate or panel 6 has a cylindrical opening 6 formed therein and a casing 7 is provided having a cylindrical passage therethrough of substantially the same size as and co-axially alined with the opening 6*. Preferably, a thin washer of yielding or substantially nonelastic material 8 is disposed between the end of easing 7 and panel 6. The casing 7 has fitting therein in the end remote from panel 6 a tube 9 of elastic material, such as well seasoned wood, the exterior of which has spaced portions 9 contacting casing 7 and the remaining cylindrical exterior of which is spaced from the inner wall of casing 7 throughout the greater part of its extent, said tube 9 projecting slightly through the opening 6. A smaller tube 10, likewise of elastic material, is disposed in and co-axially with the tube 9 and spaced from the walls thereof. The tube 10 is rovided adjacent its end nearest panel 6 with a slot 10 extending longitudinally thereof at its bottom, the slot having a central circular portion and end portions extending therefrom, as shown in Fig. 4. A spacing member 11 is disposed between tubes 9 and 10 and is alined with the slot 10. While various materials may be used for the spacing member 11, it is preferably made of yielding materill U washers 1S and 19.

al. and in the embodiment of the invention illustrated. the same is shown as-eomprising a layer of felt l1 surrounded with one or more layers of soitt yielding material 11" such as waxed leather. A pair of spaced headed and nutted bolts 12 Gilttlijiil through the member 11. through the-ends of the slot 10" and through spaced holes 9 termed in tube said tube havin; a groove or depression fl therein extending about and between said holes. Laminated washers 1;) ol yielding: material. such as telt. surround the bolts 12 adjacent: both ends thereof. said washers extending across the holes 9 and the ends of slot it), respective jv. Metal washers 1 loverlie the washers 13 and are contacted.

respectivelv by the heads and the nuts on the respective ends of bolts 12. It will be noted that the casing is cut awa at its lower end. as indicated at'i to accommodate the washers B and-14c and bolts 12. The base member also has an opening 5 therein for convenient manipulation of the bolts 12. The tube '10. preferably. is placed under stress and for this purpose, has secured thereto a resilient member 15 "toru'ied as a strand of resilient wire bent into U-s one end of which U-shapcd piece is secured to the tube by a headed and nutted bolt 16 spaced from an adjacent one of the boils 19.. The member la-preteralilv, enclosed.

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in a layer of soft yielding material and secured the said member and material are against the inner side of tube 10 by nut 16 and washer 16 on bolt 15$. member 15 will be formed normally to extend away from the interior ot tube 10 'at its end remote from bolt 16 and said member 15 will be placed under stress and brought against the interior of the tube 10 and secured in place by anotherbolt 1? similar to bolt 16.

The ends of tube?) and casino 7 remote from panel (3 are tlush and abutted ov a washer 18 ot yielding material. such as comparativelv hard rubber ant. another somewhat thinner washer 19 is spaced trom the washer the diaphragm 20 tormedot hard ic material being disposed between The washers 18 and as shown. have their openings substanti lv thesanze size as the opening throuab tube 5), The diaphragm 20 has a much smaller opening; and has disposed in said opening a headed bushing 21 threaded on its exterior and secured in the 'i'ront portion 92 of a telephone receiver 22. a small washer of somewhat resilientmaterial 21; being disposed between diaphragm 20 and portion The telephone receiver 22 comprises a rear portion of smaller diameter into which pass the usual conductors 23. A yoke or collar member 24thas .an o igening therein extending over the reduced rear portion of telephone receiver 22 andengaging the front thereof. The member has holes therethronghat each side of member 22 and bolts 01' rods 25 extend through said holes and extend at each side of the casing T forwardly to and through the panel (3 having heads and washers disposed on the exterior of said panel, said bolts 25 haviru washers and nuts disposed thereon at the rear ol' member 24 Said member is'thus drawn toward the panel 6 and the casing 7 with the parts carried thereby is clamped between the telephone receiver and the panel. by the member 2-1 and bolts A cylindrical t'tlSlll if 26 is disposed about theniembers 18. 1!) and 20 and the front part of the transmitter andheld in place by screws extending into casing 7.

In operation, the device will. stated. be mounted in the front panel of the radio receiving apparatus. and the-sound transmitted will be reproduced in the telephone receiver 2-2. The diaphragm in the receiver 22 will be actuated and will, in turn. ac tuate the diaphragm 20 which aniplilies the sound. The sound waves then pass through the tubes 0 and 10 and are modified so that a loud. distinct and pleasing tOnc issues troin the front of" the device. The tension member for tube 10 is made separate "from and spaced from the holding; means tor the tubes 9 and 10. A yielding spacingmember 11 disposed under the slot 10" is clamped and compressed between the tubes and a portion of this yielding member protrudes into slot 10, This assists in keeping the tubes 9 and 10 in perfect a vial a-linement. which is necessary for the best results. The device is very convenientlyarranged for mounting: 111 the standard radio receivlnn cabinet and it is unnecessary to have any partsmounted unonthe cabinet or separate therefrom. The device has been produced after a great dear of experimentation by the inventor and has been den'ionstrated in actual practice rand found to be very successful and eliieient.

2" will. of coursefbe understood.that: various changes may be made in thetorm. details. arrangement and proportion of the parts without departine rom the scope of applicants invention. which. generally stated. consists in a device capable of accomplishing the objects above stated. such as shown and described and in the :novel parts and combinations of parts disclosed and defined in the appended claims.

\Yhat is claimed is:

1. The combination with the panel of a radio receiving aDPuratus.-ot a sound reprodueine devieeincluding a diaphragm spaced from said panel. a tone modifying device disposed between said panel and said sound reproducing device including a plurality of spaced tubes of elastic material arranged coaidallvwith said diaphragm. and meansex- 'tending'through said panel to said sound reproducing device and securing the latter and said tone modifying device to said panel.

2. A loud speaker for a sound transmit ting. apparatus having in combination, a panel, a sound reproducing device including a diaphragm spaced from said panel, a cylindrical tone l'i'rodifying device disposed between said sound reproducing device and said panel and arranged co-axially with said diaphragm, and means secured to said sound reproihicing device and said panel for holding all of said parts in position.

3. A loud speaker for a sound dispensing apparatus having in combination, a panel, a sound reproducing device including a diaphragm spaced from said panel, a cylindrical lone modifying device disposed between said reproducing device and said panel, a member embracing said sound reproducing device and extending at each side thereof, and spaced means secured to said member and extending at each side of said tone modifying device and secured to said panel for supporting all of said parts from said panel.

a. A loud speaker for a sound transmitting apparatus having in combination, a panel, a telephone receiver spaced from said panel, a tone modifier comprising a plurality of cylindrical members disposed between said receiver and panel, a collar embracing said transmitter, and s aced rods extending from said collar to sai panel and securing and clamping said parts to said panel whereby all of said parts are supported from said panel.

5. A loud speaker for a sound transmltting apparatus having in combination, a panel having a cylindrical openin therethrough, a casing having a cylindrical passage therethrough extending at one side of said panel with said passage alined with said opening, a tube secured in said casing at the end thereof remote from said panel, a smaller tube secured in said tube co-axially therewith, adjacent the end thereof nearest said panel, said smaller tube having a slot therethrough, yielding spacing means between said tubes and alined with said slot, and securing means connecting said tubes and extending through said spacing means.

6. A tone modifying device comprising a tube of elastic material supported adjacent one end, a smaller tube disposed in said tube co-axially therewith and spaced from the walls thereof having a slot through the end thereof remote from the said end of said first mentioned tube, a yielding spacing means between said tubes alined with said slot, and securing means passing through said tubes and spacing means and clamping said spacing means therebetween, whereby said spacing means protrudes into said slot and assists in maintainin said tubes in axial alinement.

7. The structure set forth in claim 6, said securing means comprising spaced bolts, said outer tubes having spaced holes through which said bolts pass, said bolts also passing through said slot in said smaller tube, and members formed of resilient material surrounding said bolts at both ends and spanning said holes and said slot respectively.

8. A tone modifying device comprising a tube of elastic material supported adjacent one end, a smaller tube disposed in said tube co-axially therewith and spaced from the walls thereof, spacing meansbetween said tubes adjacent one end thereof, securing means holding said tubes in co-axial relation, and means secured to said inner tube spaced from said securing means for placing said inner tube under stress.

9. The structure set forth in claim 8, said last mentioned means comprising a resilient member extending longitudinally along the interior of said inner tube secured at one end and being under stress and secured at its other end.

10. A tone modifying device comprising a tube of elastic material supported adjacent one end, a smaller tube disposed in said tube co-axially therewith and spaced from the walls thereof having a slot through the end thereof remote from the said end of said first mentioned tube, said first mentioned tube having a recess on its inner side, a yielding splacing means between said tubes alined wit said slot and recess, and securing means passing through said tubes and spacing means and clamping said spacing means therebetween, whereby said spacing means protrudes into said slot and recess and assists in maintaining said tubes in axial alinement.

11. A loud speaker for a sound transmitting apparatus having in combination, a panel, a sound reproducing device including a diaphragm spaced from said panel, a cylindrical tone modifying device disposed between said sound reproducing device and said panel and arranged co-axially with said diaphragm, and means for holding said parts in fixed relative position.

In testimony whereof I aflix my signature.

FRED W. COOLEY. 

